Function MakeNumPyView

python/pyarrow/src/arrow/python/arrow_to_pandas.cc:311–341

}

Status MakeNumPyView(std::shared_ptr<Array> arr, PyObject* py_ref, int npy_type, int ndim,
                     npy_intp* dims, PyObject** out) {
  PyAcquireGIL lock;

  PyArray_Descr* descr = internal::GetSafeNumPyDtype(npy_type);
  set_numpy_metadata(npy_type, arr->type().get(), descr);
  PyObject* result = PyArray_NewFromDescr(
      &PyArray_Type, descr, ndim, dims, /*strides=*/nullptr,
      const_cast<void*>(GetPrimitiveValues(*arr)), /*flags=*/0, nullptr);
  PyArrayObject* np_arr = reinterpret_cast<PyArrayObject*>(result);
  if (np_arr == nullptr) {
    // Error occurred, trust that error set
    return Status::OK();
  }

  PyObject* base;
  if (py_ref == nullptr) {
    // Capsule will be owned by the ndarray, no incref necessary. See
    // ARROW-1973
    RETURN_NOT_OK(CapsulizeArray(arr, &base));
  } else {
    Py_INCREF(py_ref);
    base = py_ref;
  }
  RETURN_NOT_OK(SetNdarrayBase(np_arr, base));

  // Do not allow Arrow data to be mutated
  PyArray_CLEARFLAGS(np_arr, NPY_ARRAY_WRITEABLE);
  *out = result;
  return Status::OK();
}

class PandasWriter {
 public: